Device for checking the profile of workpieces



Oct. 26, 1943. Q c. H. BJORKBOM 2,332,983

DEVICE FOR CHECKING THE PROFILE OF WORK PIECES Filed Dec. 26, 1940 2 Sheet s-Sheet 1 i?) 0 0&9

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8 INVENTOR Carl Hjalmar Bjbrkbom EMMY Oct; 26, 1943.

C. H. BJCRKBOM DEVICE FOR CHECKING THE PROFILE OF WORK PIECES Filed Dec. 26, 1940 2 Sheets-Sheet 2 Fig. 3.

11 38 I l 5 53 5 49 45 46 51 J 36 43 44 48 I" /31 3 Q wx;

57 I 1 JSN {g I'NVENTOR 3 Carl Hjalmar Bjdrkbom Fig.4.

HI ATTO EY Patented 0a. 26, 1943 met:

DEVICE Seen.

object and the template." To check the forms of an object according. to this methodtis however. exceedinglytrying for gthe eyes of the operator, and furthermorefthe accuracy :of r the gauging operation will be dependent upon the carefulness; and. attention: of the: operator. This method is further only suitable for examining: external .SllI-l- EJ ZJ HE U ,5; f 9 EG 'r'CarhHjalmarBjiirkbom, eoeborg,estan, is;

y' signorcm Aktiebolaget Svenska.Kullage1-fab k n; Web r. swe ggwwrnom n f re-p v. Application'December26,1940;

' f InpSwIedenJanuary 20, 1940 3 Cl aims. gorge-hm faces. Y a In some}: other. cases the .Iormsaoftheobject arechecked by using marking acolor ap-1 plied to a marking rolliorthe like, which is sub.-- sequently rolled against the surface to be examined. Both the methods mentioned are however time wasting,- and the; result :depends on the skill of the operator. :The object of .the invention is'to obviate. these. inconveniences. The gauging device according to the invention is characterized" I substantially; thereby that itsag'auging surface is.

divided into a number of segments, whichvare firmly connected to each other buts-electrically? insulated from each other and coupledxinglelectrical circuits, and that signal members suchzzas electric; lamps are. arranged inthe circuits for. the purpose of indicating .whether' the;-corresponding segment is in'contactwiththe work piecexor not. With the aid of the gauging are: rangement according .tostheinvention an accuracy is attained which is-fully. equivalent to and in certain cases. surpasses theaaccuracyafiorded; by methods hitherto :known; The gauging z-ar-. rangement according to the invention canbe used:

for checking external as well as internal surfaces and profiles, I V i E The drawings enclosed show an embodiment of the v a inaw i Fig. 1; is a schematical 1 horizontal projection of the gauging arrangement and auworlr, piece;

shown in section,

Fig. 2 is a partialjvertical projection f the.

arrangement accordin to Fig l seen in-the direction of the arrows I I-II:in Fig. 1', 3.. l

Fig; 3 shows the contact points ofthe checkingsegmentswiththe work, piece on an enlarged scaleand signal lamps coupled to the segments, and

Fig. 4 shows a section through the controlling segments and their electric connections.

Serial N0; 371654 In' the drawings the gaugihgiarrangement is showmappliedior checking the inner ringsJ of cylindrical roller ibearin'gs. The examination has the purpose .to determine whether the generatrix of the race is rectilinear. Previously thischecknumber ofi'work-cdntacting membersji. e:,plates' H,l2,- I3, l4; l5i'anlil6 (Figs. 3 and 4) 'of electrically conducting material which are separated from each other by=insulatirigpartitions and kept togetherin a'fiparcel or gauging unitrgenerally designated with :2 in Figs. 1 and 2;; v hiter their assembly as aimnit thevplates have been very eXa'c'tly worked into cylindrical form. Each plate I l'- -'l 6 iis co'nnected to thepin of aplug contact, schematically shown: at' '4 -in-Figure 1; by an electric conductor l *The different contactpins are. provided for: engagement 1 in corresponding contactsleeves-of a 'contact socket 5 Which'over a plurality of parallel conductors 6 "are connected to -three batteries *1; In ea'chwconductor. 6* is coupled a signalblamp 2|; 22,323, 24=,T25,- andZfi. The b atteries are intheir turn connected'to a electrically conducting support plate 8.

"When a roller bearing ring. is .to be examined, it ismplacedonthe support plate 8,"as'shoWn in Fig: 2, andwrolled forwarduntil it enters into contact with the gauging unitiZ. The roller hearing ring hereby-closes a'number-of circuits, each of which comprises. aebattery :1, a-lamp 2l26 and a. contact plate -:I l- -i 6. If the generatrix of the roller bearing ring race is rectilinear, all the contact .plates come into contact with the. race and all thesignal-lamps connected to the circuits of the respectivecontact plates arelighted. .In this case the-workpiece .c a n thus beaccepted.

;-If; on the other hand, as shown in Fig ,3, the generatrix of the race deviates-from the rectilinearity, one-or more circuits remain .broken and the corresponding lampsremain dar k, .In Fig. 3 the contact plates l l,- l2; and I6 areshown in -.conducting, connection -.with;.the roller bearing ring, and consequently the corresponding lamps 2|, .22, .and lli are burning. The contact plates 1}; l4, and lion the contrary arejout of con tact with the roller bearing ring, and the corresponding lamps 23, 24, and 25 remain dark.

The roller bearing ring shown in Fig. 3 is therefore to be rejected. It is also of importance that the voltage of the In Fig. 4 the gauging unit and its electric contacts are shown more in detail than in Fig. 1.

The contact p1ateis'; ll"-l6 are 'iastenewwitn:

close fit ona tubeso-or Bakeliteor'bther in'su-' lating material, and the tube 30 in its turn is able for the examination of difierent surfaces of rotation with curved generatrix. The gauging arrangement according to the invention can also be used for checking plane surfaces or any placed on a sleeve 3|. At both sides of the con 1,

tact plates ll-IG a couple of end plates 33 are provided,and the contact plates'are'; sep-l;

arated from'these and from each other by insulating interlinings 34. The platesandfthe inter-- linings are supported as a. unitby thesleeve 3i and are kept together betweerf aprotrudir' flange 35 on the sleeve 3| and a nut 36 firmly screwed onto the sleeve soithatt a 'mutual dis- 5:1

" *bers::beingbored through in several places,

placement cannot take place.

From one end of the checking unit six screws pass through holes in the plates and the interli'ningsa Onelofthese screws, designated with 31 inLFig}. 4', extends 1freely through the contact plates! L12, l3, l4, and I59, It is separated from these byra Bakelite5tube38 and threaded into the contact plate 46. Another; screw'locatedr at the side of the screw 3'! passes freely through thecontact plates ILLIZ, .13, I4, and I6 and is fixedly screwediinto the contact plate l5; The lowermostscre'w' 5'lashown in Fig.- .4 is screwed into plate; l3,-goes freely through plates l4;' l5 and-l6, and'is separated by means of a Bakelite tube from the contact-plates l I, I2. In the'corresponding manner each of the six screwsis threadediinto and is incurrent conducting iconnect'ioni with onezof the contact plates and goes freelythrough some ofi the plates and 'isby means-r insulating: material or air xgaprinsuelated from the other contact'plates. I i -Whenr.the-gauging'.unit' is to be 'used, itis placed on .a plug 40. The gauging ,unit is'held to the plug llfl. byi'neansqf a nutull and a'washer alone end of theplugzflll is" bored and receives the endjof a multiple conductor cable '43. which is. retained inlitby means of a rubber' bushin 44-, a sleeve'45 anda a. nutAGJFrFrom the! end 0 the: cable-item conductors extend" through holes 48in: the' 'pl1ig", .and the ends of the conductors are retained by means of screws 49011 a ring 50 of canvas or'iother insulating and preferably somewhat elastic materiah 'In order to obtain thedesired -angle of the gauging unitin relationto 'the plugdfl a pin l is providedon it, and thefsleevej3l of the gauging unit-is provided with a holeg for] engagement with the pin' 5|. When the gaugingfi unit isplaced on the' 'p'lug Mland retained by the nut fll j-the headsof the screws 29, S' I will abut ag ainst"th headscf six of the screws V'QQQTHGTGI'DY each contact [plate I l -I 6 "is; put in conducting 1) connection with a conductor inthecable 43; which is' -conncted to the plug contact l; schematically shown in Big; -7,. Th 1 8 "an h wbl 43 'bfus d' connection with: different gauging; aggregates h k n ixd rer nir i e I h 'e bqd mentfexemplified ih "the drawi ngs the gauging unit ca'n have' up to;ten controlsegments.

I The inventio'n is' nptIlimitedto the embodimentjj described above, but comprises all possible m d fication .11 he. mefi Ini d i s, the fgauging arrangement :is shown' as used ior checking,cylindricalsurfaces, bu also usecurved or broken surfaces, in which case the gauging;"surfaces of thej control "segments tog'ether conform with the desired geometric form of the object to be examined.

'JlilHaving thus described my invention, I claim -10- ff ollowing'z' and desire ,to,,,secu re by Letters Patent the 1.'In a devicef or checking the profile of a workpiecegthe combination of a plurality of workpon-acna "15ing members, means for holding the work-conelmbers separated by insulattacting members and the insulating members firmlylrtogetherto ,Iorm a template, said memscrews;,-extending through the said bores, said screws being threaded respectively in the workcontacting members; and electrically 'iinsulated fromrthe othercwork-contacting members,. paral-' lel electrical cconnections"through: said '';-'screws to 1 the contact me'mbers'; electrical .xsignalling de-' vices arranged: in said electrical "connections, a sourceof p0wer,-a pole of which is' connected to said electricalllconnections, a member'of conductingfi mat'erial' located outside the profile defined by the work-contacting members and connectedzto theoppo'site pole-"of said source'ofpower,;:.thet SOllI'CQiOf power, the electrical scon nection'sg' the signalling devices, 1 the work-contacting' membrs andl'the'rmember 'of conducting material'forming togetheria number of electrical circuits to be closedby the work piece through its'icdritact -wi'th' the work-contacting members along Tthe. iprofile: to ub'e checked? and with the memberv 9f Tcohfiucting: material at "a; part of: the work piecei locatedt." outside the-profile to be checked the"last mentionedr member Iforminga common'parFof the circuits. I. l I 12". :Devi'ces iacco'rding to Yclaim :1, ."wherein the heads of th'e is'crews'i'are located on theorie side of ithe templateunitl a cable terminal provided with' a number of f conducting contact 1 members, and 3 means. for. holding the 5 'contact' imembers againsti'the screwheads to complete saidz'paral'-- lelf'connectionsi -"3iilni' a device for checking the profileiof "a workpiece, aitemplate' consisting of aplurality 0'1 r'separateielectrically conductive elements as= sembled'in series l arrangement so as jointlyto' define I a pr'ofilea corresponding to" I that desired i-n 'the work piece, said elements being narrow and-set close together andbeing thereby adapted toicont'act the-work piece in a plurality of closely adjoin'ih'gpointsalong the profile to bechecked, avplurality ofaelectrical circuits each containing drie omy qr said: elements to ether with an ind'ependent' signal': device to indicate flow 'o f curre'nt in the circuit, a support member located entirely to oneside'of' ana apartfrdm the said assembly of profile-defining elements andadapted to support are work'fpi'e'ce in' oper'a'tive cbntact-with the template, said support-"banger electrically conductive material and connected iii s'e'ries'with the saidelements' andysijgnal d'evics of therespective circuits an constituting a' sole'means common to all of {said circuitsiar completing the circuits-through the work piece. j

i CARAHJALMARBJoRKBQMjJ 

